MacOS Docker had performance problems and odd limitations because it was really a Linux VM under the hood (Darwin can't run containers) and any host passthru stuff needed that additional hypervisor translation, which wasn't always perfect either.

People raising bugs against "production" wouldn't tell you that they found it their Macbook so you'd go on a wild goose chase thinking it was a real issue and not simply MacOS sucking.

Alternately, you'd write a script to do something (flash hardware, etc) and it wouldn't work because Certified Real UNIX(tm) doesn't have /proc or /sys. Now you're asked to port the script to Mac, which depending on the task might be wildly more difficult, but if you don't willingly bash your head against Apple's hatred for low level hacking, you're not a team player or something.